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The law stating that the direct current flowing in a conductor is directly proportional to the potential difference between its ends. It is usually formulated as V = IR, where V is the potential difference, or voltage, I is the current, and R is the resistance of the conductor.

Ohm's Law

Following are the formulas for computing voltage, current, resistance and power. Traditionally, E is used for voltage (energy), but V is often substituted.

V or E = voltage (E=energy)
I = current in amps (I=intensity)
R = resistance in ohms
P = power in watts

V = I * R E = I * R

I = V / R I = E / R

R = V / I R = E / I

P = V * I P = E * I